Stihl 4180 Series Manual page 34

1
: Fit locking screw (1)
4180 890 2700 in spark plug
hole.
1
2
– Rotate crankshaft counter-
clockwise until the piston butts
against the locking screw.
: Remove the hex. nut (1).
: Remove the starter cup (2).
– Remove the locking screw.
Series 4180 Powerhead
1
: Take out the screws (arrows).
: Carefully lift away the cam gear
cover (1).
: Rotate crankshaft clockwise until
cam lobe points downward.
2
1
: Check that arrow (1) lines up with
the right-hand screw (2) on the
ignition module.
1 2
: Marks (arrows) on cam gear (2
and 3) must line up with the
notches (1 and 4) in the cylinder.
2 3
1
Cam gear cover must be fitted
before checking and adjusting valve
clearances.
: Insert feeler gauge
4180 893 6400 (2) between
rocker arm and valve stem.
The feeler gauge must slip through
with a certain resistance.
Inlet valve (1): 0.10 ± 0.02 mm
Exhaust valve (3): 0.10 ± 0.02 mm
3 4
33